simultaneousness
|si-mul-ta-ne-ous-ness|
🇺🇸
/ˌsɪməlˈteɪniəsnəs/
🇬🇧
/ˌsɪm(ə)lˈteɪniəsnəs/
occurring at the same time
Etymology
'simultaneousness' originates from English, ultimately from Latin; specifically from the Latin root 'simul', where 'simul' meant 'at the same time'. The English noun is formed by adding the suffix '-ness' to the adjective 'simultaneous'.
'simultaneous' came into English via Late Latin/Medieval Latin 'simultaneus' (from Latin 'simul'). The adjective 'simultaneous' developed in Middle/Late English, and the noun 'simultaneousness' was formed in modern English by adding the productive suffix '-ness' to create an abstract noun.
Initially the root 'simul' meant 'at the same time'; over time this idea was incorporated into the adjective 'simultaneous' and then into the noun 'simultaneousness', which now specifically denotes 'the quality or state of occurring at the same time'.
Meanings by Part of Speech
Noun 1
the quality or state of being simultaneous; occurring at the same time.
The simultaneousness of the two announcements caused confusion among the staff.
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Noun 2
the state in which events occur at exactly the same instant (often used in technical, philosophical, or scientific contexts).
In relativistic physics, the simultaneousness of distant events can depend on the observer's frame of reference.
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Last updated: 2025/12/27 00:10